oh_riginal said:

One idea would be when Han Solo calls the Stormtroopers onboard the Millennium Falcon to ambush them and steal their uniforms, there be lots of violent sounds, laser blasts, a few punches, someone yelling "grenade!" followed by an explosion that shakes the screen... then when Luke steps out all he has is a faulty transmitter.

Just an overexaggerated version of the laser blast continuity error, basically.

A Tom (from Tom & Jerry) scream would fit very well in there.

This one to be precise: http://youtu.be/UV1Tc2fdkGc?t=8s